CAJ | 학술논문

运用循环伏安法、线性电位扫描法研究木糖醇在碱性溶液(含锑)中的电化学稳定性及锑在木糖醇碱性溶液中的沉积动力学参数；采用计时电流法研究锑在不锈钢阴极上的电化学成核机理.循环伏安测试结果表明,木糖醇在碱性溶液中的稳定性较好,在-1.20 V～+0.60 V(vs Hg/HgO)范围内无氧化还原反应发生,在电位负于-1.70 V(vs.Hg/HgO)时木糖醇在锑电极上可能发生分解.在该体系中,锑在阴极上的沉积经历了不可逆电结晶过程.根据线性电势扫描结果,锑沉积的活化能、表观传递系数、交换电流密度等动力学参数分别为46.33 J/mol、0.64和4.40× 10-6 A/m2.计时电流法实验结果表明,锑在碱性木糖醇溶液中的成核机理符合扩散控制下的三维连续成核模型,外加电位对晶体生长速率和恒定电位下的饱和晶核密度有显著影响.通过分析恒电位阶跃曲线,求出锑离子在该体系中的扩散系数为1.53×104 cm2/s.
운용순배복안법、선성전위소묘법연구목당순재감성용액(함제)중적전화학은정성급제재목당순감성용액중적침적동역학삼수；채용계시전류법연구제재불수강음겁상적전화학성핵궤리.순배복안측시결과표명,목당순재감성용액중적은정성교호,재-1.20 V～+0.60 V(vs Hg/HgO)범위내무양화환원반응발생,재전위부우-1.70 V(vs.Hg/HgO)시목당순재제전겁상가능발생분해.재해체계중,제재음겁상적침적경력료불가역전결정과정.근거선성전세소묘결과,제침적적활화능、표관전체계수、교환전류밀도등동역학삼수분별위46.33 J/mol、0.64화4.40× 10-6 A/m2.계시전류법실험결과표명,제재감성목당순용액중적성핵궤리부합확산공제하적삼유련속성핵모형,외가전위대정체생장속솔화항정전위하적포화정핵밀도유현저영향.통과분석항전위계약곡선,구출제리자재해체계중적확산계수위1.53×104 cm2/s.
The electrodeposition of antimony in alkaline solutions containing xylitol was investigated using cyclic voltammetry,linear sweep voltammetry and chronoamperometry.The antimony electrodeposition and the chemical stability of xylitol in alkaline solutions were studied by cyclic voltammetric technique.Apparent activation energy,apparent transfer coefficient and exchange current density were obtained by linear sweep voltammetric technique.Initial stages of antimony electrocrystallization were determined by chronoamperometry.Xylitol in alkaline solutions exhibits high chemical stability and there is no redox in solutions when the potential ranges from -1.20 V to +0.60 V (vs Hg/HgO).There is no other redox reaction but hydrolysis occurring on stainless steel in the potential range of-1.75 V to 1.25 V (vs Hg/HgO) while the xylitol decompnsition maybe take place on antimony electrode when potential is more negative than -1.70 V (vs Hg/HgO).Cyclic voltammograms with different scan rates indicate that the antimony eleetrodeposition process is an electrocrystallization which is a completely irreversible electrode process.The apparent activation energy,apparent transfer coefficient and exchange current density were calculated to be 46.33 kJ/mol,0.64and 4.40× 10-6 A/m2,respectively.The analyses of the chronoamperometric responses support the view of a three-dimensional growth under progressive nucleation.The average diffusion coefficient of antimony was calculated to be 1.53× 10-6 cm2/s.